Availability of Coupler Lock With a 5/16 inch Pin Diameter

Updated 04/04/2025 | Published 07/13/2017

Products Featured in This Question

etrailer Trailer Coupler Latch Lock - 2" Span - 1/4" Diameter - Chrome

(249)

$19.37

Master Lock Adjustable Trailer Coupler Lock - Stainless Steel

(102)

$11.09

etrailer Trailer Hitch Receiver Lock for 2" Hitches - Flush - 2-5/8" Span - Chrome

(3462)

$23.88

Question:

I bought this lock, and I got the wrong size diameter pin, I need this lock with a 5/16 inch pin diameter. Is there one available. Thank You

asked by: Keith C

Expert Reply:

A pin with a 1/4 inch diameter, like part # e98886, is standard for coupler locks. Unfortunately there are none that are 1/16 of an inch larger in diameter.

If instead you meant that you needed one with a span of 5/8 of an inch then you will want to go with the Master Lock Adjustable Trailer Coupler Lock # 2847DAT which has a 5/8 inch adjustment setting.

If you meant that the pin diameter needed to be 5/8 inches then you are looking for part # e98880.

expert reply by: Jon G

New R.

4/1/2025

Have a lock pin that is 3/8” thick need a lock to keep from being stolen. Does anyone sell a lock pin with keys that can fit that small diameter?

Jon G.

4/1/2025

@NewR The closest we have to a 3/8" locking pin is the 1/4" Pin # e98886 that I referenced above. Aside from that, you'll need to look elsewhere for a 3/8" diameter if that's what you really want.

New R.

4/4/2025

@JonG I tried the 1/4 inch and it won’t fit in the hole. I would have thought it would be standard across. What do you recommend since this is from manufacturing? Should I drill the hole larger? I can’t seem to find a lock that will fit.